These are heavy duty springs.
Barnett Heavy Duty Clutch Spring Set - 502-00-01008 for Harley Big Twin 1998-2016
EBC Heavy Duty Clutch Spring Set Fits SUZUKI GSF1200 BANDIT (1996 to 2006)
EBC Heavy Duty Clutch Spring Set Fits YAMAHA WR125R / WR125X (2009 to 2016)
EBC Heavy Duty Clutch Spring Set For KAWASAKI ER6F ER6N (2006 to 2016)
EBC Heavy Duty Clutch Spring Set For HONDA CBR900RR FIREBLADE (1996 to 2003)
EBC Heavy Duty Clutch Spring Set Fits APRILIA RS125 (1992 to 2014) (2T)
